Preparation method of porous anode aluminum foil with multi-stage mixed structure

A mixed structure, porous anode technology, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of small electrostatic capacity of electrode foil, and achieve the goal of improving flashover voltage, low leakage current and large specific capacity Effect

Active Publication Date: 2020-09-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method for preparing a porous anode aluminum foil with a multi-stage mixed structure, which has solved the problem of using aluminum powder with a single size in the existing electrode foil preparation method to cause the electrode to be prepared. Problems with small foil capacitance

Method used

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  • Preparation method of porous anode aluminum foil with multi-stage mixed structure
  • Preparation method of porous anode aluminum foil with multi-stage mixed structure
  • Preparation method of porous anode aluminum foil with multi-stage mixed structure

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Mix fibrous aluminum metal with an average particle size of 20 μm (purity above 99.99%) and aluminum metal particles (ellipsoid) with an average particle size of 500 nm at a ratio of 20:1 to obtain a mixed raw material, and mix the raw material and acrylic resin by 1 :1 mass ratio is mixed, and the mixture is dispersed in toluene to form a 60% dispersion and the dispersion is coated on a 40 μm aluminum foil, sintered at 600 ° C under vacuum, and finally in 3% boric acid solution (60 ℃) anodized to 1000V. Anodizing condition: 150mA·cm -2 , constant pressure for at least 10 minutes, annealing in air at 600°C for 2-5 minutes, and shape correction for 5 minutes.

[0041] The electrode foil prepared according to the method described in this example was tested for electrostatic capacitance with an LCR meter, and the results are shown in Table 1.

Embodiment 2

[0043] Mix ribbon-shaped aluminum metal material (purity above 99.99%) with an average particle size of 10 μm and aluminum metal particles (spherical) with an average particle size of 200 nm at a ratio of 10:1 to obtain a mixed raw material, mix the raw material and ethyl cellulose Mix according to the mass ratio of 2:1, and disperse the mixture into trichloroethane to form a 60% dispersion and coat the dispersion on a 35μm aluminum foil, sinter at 550°C under vacuum, and finally in 5% Anodized to 800V in boric acid solution (60°C). Anodizing condition: 100mA·cm -2 , constant pressure for at least 10 minutes, annealing in air at 550°C for 2-5 minutes, and shape correction for 5 minutes.

[0044] The electrode foil prepared according to the method described in this example was tested for electrostatic capacity by using an LCR meter, and the results are shown in Table 1.

Embodiment 3

[0046] Mix aluminum flakes (purity above 99.99%) with an average particle size of 5 μm and aluminum metal particles (block shape) with an average particle size of 50 nm in a ratio of 0.5:1 to obtain a mixed raw material, mix the raw material and ethyl cellulose in 3 :1 mass ratio for mixing and dispersing the mixture into methyl ethyl ketone to form a 50% dispersion and coating the dispersion on a 35 μm aluminum foil, sintering at 500°C under vacuum, and finally in 10% of Anodized to 400V in boric acid solution (85°C). Anodizing condition: 50mA·cm -2 , constant pressure for at least 10 minutes, annealing in air at 500°C for 2-5 minutes, and shape correction for 5 minutes.

[0047] The electrode foil prepared according to the method described in this example was tested for electrostatic capacitance with an LCR meter, and the results are shown in Table 1.

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Abstract

The invention discloses a preparation method of a porous anode aluminum foil with a multi-stage mixed structure, and belongs to the field of aluminum electrolytic capacitors. Large-size aluminum metalhas a large specific surface area and high surface uniformity; small-size aluminum metal particles can play a role in supporting a three-dimensional structure during melting; high porosity of the electrode foil is maintained, meanwhile, an electron transmission channel is added, the aluminum substrate is coated with the large size aluminum and the small size aluminum particles in a mixed mode, anodic oxidation is conducted in an ammonium adipate or boric acid electrolyte, the porous electrode foil of a nano-micron multi-stage mixed structure can be obtained, and the electrode foil has high electrostatic capacity and low leakage current. The method can be used for large-scale industrial manufacturing, the specific volume of the anode aluminum foil for the aluminum electrolytic capacitor can be greatly improved, light weight and miniaturization of the aluminum electrolytic capacitor are promoted, and the comprehensive performance of the aluminum electrolytic capacitor is improved.

Description

technical field [0001] The invention belongs to the field of aluminum electrolytic capacitors, and relates to a preparation method of a porous anode aluminum foil with a multistage mixed structure. Background technique [0002] Aluminum electrolytic capacitor is an energy storage device with large volume specific capacity and overwhelming cost per unit capacity. It is widely used in household appliances, communication equipment, digital electronics, industrial frequency conversion, automotive electronics and other fields. The electrode aluminum foil of aluminum electrolytic capacitors is usually prepared by electrochemical corrosion method to obtain a porous structure of corroded aluminum foil, and then an aluminum oxide film is grown on the surface of the corroded aluminum foil through anodic oxidation, so as to exert its dielectric properties. The porous structure ensures the specific surface area of ​​the anodized electrode foil, according to the capacitance formula: [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/052C25D11/08C25D11/18
CPCC25D11/08C25D11/18H01G9/045H01G9/052
Inventor 杜显锋李响熊礼龙
Owner XI AN JIAOTONG UNIV
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